Szukana fraza: [Abstract = "The most likely causes for the overall decrease of Jackdaw numbers in Zielona Góra include renovation, modernisation and thermal insulation of buildings in the Old Town and in housing estates, leading to a decline in space available for nesting. Other significant factors are the lack of food sources in the city centre and an increasing degree of urbanisation. Furthermore, the city is surrounded by dense pine monoculture which undoubtedly has a negative influence on the number of Jackdaws."]

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